Page 106 - ICSE Science 3 : E-book

Filtration
f ilter paper
We can remove insoluble impurities from water by f iltering
funnel
it through either a f ilter paper or a very f ine muslin cloth.

The impurities are left behind on the f ilter paper or on the
cloth and clean f iltered water is obtained.

Boiling

The best and safest method to purify water is boiling.

Boil water for at least 10–15 minutes to kill all the germs
present in it. Store the boiled water in clean and covered
vessels.

Chlorination

Germs present in water can also be killed by adding
chemicals like chlorine to it. It is nowadays easily
available in the market in the form of tablets. The process

of purifying water using chlorine is called chlorination.
This method kills germs in water and prevents the

spread of waterborne diseases.

TIME TO REVISE

Name the methods by which impurities can be removed from water.

__________________ __________________ __________________

Rainwater Harvesting
Did You Know!
Shortage of water has become a major
Rainwater harvesting is a cheap
problem these days. Thus, it is necessary method of collecting and using water.
for us to conserve water. This can be done It reduces the need of tap water and

by a simple method called rainwater helps to reduce our water bill.
harvesting.

Rainwater harvesting means collection and storage of rainwater in man-made

structures for use in future. By doing this, we do not let rainwater go down the
drains and get wasted.

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